<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<div style="margin-left: 400px;">
		<img alt="规范" src="a25.jpg" /><br /> 
		<img alt="样例1" src="b25.jpg" /><br />
		<img alt="样例2" src="c25.jpg" />
	</div>
</body>
</html>